Path: csiph.com!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Tim Rentsch Newsgroups: comp.lang.c Subject: Re: technology discussion =?utf-8?Q?=E2=86=92?= does the world need a "new" C ? Date: Tue, 09 Jul 2024 14:23:47 -0700 Organization: A noiseless patient Spider Lines: 39 Message-ID: <86v81e8djw.fsf@linuxsc.com> References: <871q48w98e.fsf@nosuchdomain.example.com> <87wmlzvfqp.fsf@nosuchdomain.example.com> <87h6d2uox5.fsf@nosuchdomain.example.com> <20240707164747.258@kylheku.com> <877cdur1z9.fsf@bsb.me.uk> <871q42qy33.fsf@bsb.me.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Date: Tue, 09 Jul 2024 23:23:48 +0200 (CEST) Injection-Info: dont-email.me; posting-host="4404f50b61bba69374b6468dfb9554fc"; logging-data="1623985"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1875uu2D/zlg5eSJO1jC1tFfYPbg85dY08=" User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux) Cancel-Lock: sha1:N25XN7+lCa9EdgO8Ya0fF44ljwA= sha1:xZYlOBnuKT0nOe/rzK+LLQdZvc8= Xref: csiph.com comp.lang.c:386962 bart writes: > On 09/07/2024 18:22, Ben Bacarisse wrote: > >> bart writes: >> >>> On 09/07/2024 16:58, Ben Bacarisse wrote: >>> >>>> bart writes: >>>> >>>>> Arrays are passed by reference: >>>>> >>>>> void F(int a[20]) {} >>>>> >>>>> int main(void) { >>>>> int x[20]; >>>>> F(x); >>>>> } >>>> >>>> This is the sort of thing that bad tutors say to students so that they >>>> never learn C properly. All parameter passing in C is by value. All of >>>> it. You just have to know (a) what the syntax means and (b) what values >>>> get passed. >>> >>> The end result is that a parameter declared with value-array syntax is >>> passed using a reference rather than by value. >>> >>> And it does so because the language says, not because the ABI requires >>> it. A 2-byte array is also passed by reference. >> >> An address value is passed by value. C has only one parameter passing >> mechanism. You can spin it as much as you like, but C's parameter >> passing is simple to understand, provided learner tune out voices like >> yours. > > Little about C's type system is simple. You're doing your students a > disservice if you try and hide all the quirks. That's what you are doing, only worse.